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Diagnosis
Posted: Sat May 19, 2012 7:16 pm
by Novice1
Last night was the first time I pushed my car on high boost to the max.
I had done so in 1-3 gears went like a train.
Sitting on about 4000 rpm in 4th gear on high boost I put the foot to the floor. Noticeable hesitation jerkiness, jumping around like a kangaroo.
So i tried to replicate it and thrashed it thru gears 1-4. Again first rhree gears awesome, fourth gear at about 4500 revs its like hitting a wall.
Anyone got any ideas on possible causes.
cheers novice1
Re: Diagnosis
Posted: Sat May 19, 2012 7:23 pm
by NitroDann
Either boosting past the end of the fuel map, or hitting boost cut, or running out of fuel due to pump failure or blown a hose..?
Dann
Re: Diagnosis
Posted: Sat May 19, 2012 7:50 pm
by JBT
Novice1 wrote:So i tried to replicate it and thrashed it thru gears 1-4. Again first rhree gears awesome, fourth gear at about 4500 revs its like hitting a wall.
What revs did you get to in the first 3 gears?
Re: Diagnosis
Posted: Sat May 19, 2012 8:01 pm
by Novice1
First 3 gears 7000 rpm.
novice1 aka ron
Diagnosis
Posted: Sat May 19, 2012 8:12 pm
by gslender
Not the clutch slipping is it?
Re: Diagnosis
Posted: Sat May 19, 2012 8:16 pm
by Novice1
Better not be the clutch, just had new one installed.
novice1
Re: Diagnosis
Posted: Sat May 19, 2012 8:34 pm
by JBT
Novice1 wrote:First 3 gears 7000 rpm.
novice1 aka ron
Weird. Doesn't really seem like fuel if the engine will run up through the gears. The only difference would be a higher engine load in 4th. Ignition system breaking down maybe?
Re: Diagnosis
Posted: Sat May 19, 2012 9:10 pm
by Novice1
Whatever it is perhaps one way to test is on dyno. Fourth gear on high boost is not something you can do on the streets during normal hours.
Novice1
Re: Diagnosis
Posted: Sat May 19, 2012 9:30 pm
by JBT
Have you got a spare set of plug leads you can try on it?
Re: Diagnosis
Posted: Sat May 19, 2012 9:35 pm
by NitroDann
Does your car have stock ignition?!
Dann
Re: Diagnosis
Posted: Sun May 20, 2012 5:11 am
by Novice1
As far as i know the ignition is stock.
Novice1
Re: Diagnosis
Posted: Sun May 20, 2012 9:51 am
by JBT
Wouldn't hurt to try a known good set of leads and/or plugs and see if that fixes it Ron. You can always keep them as spares if it doesn't work and you'll have eliminated that part of the system as a cause of the problem.
Re: Diagnosis
Posted: Sun May 20, 2012 10:10 am
by timk
Maybe try a plug with a smaller gap, you are running like 20 psi yeah?
I'm doing a Toyota COP conversion in mine because of the fairly weaksauce ignition in the early NBs, I'll let you know how it goes.
Re: Diagnosis
Posted: Tue May 22, 2012 3:11 pm
by spaztikcamel
sounds like time for cops
problem seems to be load related.
im not sure if you can feel detonation but it could be this.
Re: Diagnosis
Posted: Tue May 22, 2012 3:20 pm
by manga_blue
spaztikcamel wrote:sounds like time for cops
problem seems to be load related.
im not sure if you can feel detonation but it could be this.
I like to diagnose a problem before I fix it. After plugs and leads I'd try to borrow a known good stock coilpack to see what difference it makes.